Self-sorted photoconductive xerogels

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Electronics

Background:

• Perylene bisimide (PBI) and stilbene derivatives are known for their unique photophysical properties.
• Self-assembly of gelators into ordered structures is crucial for advanced material applications.
• Controlling the morphology and properties of multicomponent gels remains a significant challenge.

Purpose of the Study:

• To investigate the formation and properties of self-sorted gels composed of PBI and stilbene-based gelators.
• To explore the impact of self-sorting on the photoconductive properties of the resulting xerogels.
• To understand the photophysical mechanisms underlying the enhanced performance of these multicomponent systems.

Main Methods:

• Gelation induced by a slow pH change via glucono-δ-lactone (GdL) hydrolysis.
• Characterization of self-sorting using Nuclear Magnetic Resonance (NMR) spectroscopy, UV-Vis spectroscopy, rheology, and viscometry.
• Photoconductivity measurements and transient absorption spectroscopy to probe electronic properties and dynamics.

Main Results:

• Successful formation of self-sorted gels from PBI and stilbene gelators.
• Demonstrated photoconductivity in the resulting xerogels with altered wavelength dependence compared to PBI alone.
• Evidence of PBI radical anion formation within picoseconds in the presence of stilbene, observed via transient absorption spectroscopy.

Conclusions:

• The controlled self-sorting of PBI and stilbene gelators leads to materials with unique optoelectronic properties.
• The formation of PBI radical anions under visible light enhances the spectral response of the multicomponent gels.
• These self-sorted gel systems hold significant potential for applications in visible-active optoelectronics.